2 * Copyright 2017 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/portability/Fcntl.h>
20 #include <folly/portability/Sockets.h>
21 #include <folly/portability/SysStat.h>
22 #include <folly/portability/Windows.h>
25 namespace portability {
27 int creat(char const* fn, int pm) {
28 return _creat(fn, pm);
31 int fcntl(int fd, int cmd, ...) {
37 HANDLE h = (HANDLE)_get_osfhandle(fd);
38 if (h != INVALID_HANDLE_VALUE) {
40 if (GetHandleInformation(h, &flags)) {
41 res = int(flags & HANDLE_FLAG_INHERIT);
47 int flags = va_arg(args, int);
48 HANDLE h = (HANDLE)_get_osfhandle(fd);
49 if (h != INVALID_HANDLE_VALUE) {
50 if (SetHandleInformation(
51 h, HANDLE_FLAG_INHERIT, (DWORD)(flags & FD_CLOEXEC))) {
58 // No idea how to get the IO blocking mode, so return 0.
63 int flags = va_arg(args, int);
64 if (flags & O_NONBLOCK) {
65 // If it's not a socket, it's probably a pipe.
66 if (folly::portability::sockets::is_fh_socket(fd)) {
67 SOCKET s = (SOCKET)_get_osfhandle(fd);
68 if (s != INVALID_SOCKET) {
69 u_long nonBlockingEnabled = 1;
70 res = ioctlsocket(s, FIONBIO, &nonBlockingEnabled);
73 HANDLE p = (HANDLE)_get_osfhandle(fd);
74 if (GetFileType(p) == FILE_TYPE_PIPE) {
75 DWORD newMode = PIPE_READMODE_BYTE | PIPE_NOWAIT;
76 if (SetNamedPipeHandleState(p, &newMode, nullptr, nullptr)) {
89 int open(char const* fn, int of, int pm) {
91 int realMode = _S_IREAD;
92 if ((of & _O_RDWR) == _O_RDWR) {
93 realMode = _S_IREAD | _S_IWRITE;
94 } else if ((of & _O_WRONLY) == _O_WRONLY) {
96 } else if ((of & _O_RDONLY) != _O_RDONLY) {
97 // One of these needs to be present, just fail if
101 if (!strcmp(fn, "/dev/null")) {
102 // Windows doesn't have a /dev/null, but it does have
103 // NUL, which achieves the same result.
106 errno_t res = _sopen_s(&fh, fn, of, _SH_DENYNO, realMode);
107 return res ? -1 : fh;
110 int posix_fallocate(int fd, off_t offset, off_t len) {
111 // We'll pretend we always have enough space. We
112 // can't exactly pre-allocate on windows anyways.